This is my "go-to" whipped cream dispenser recipe for my Isi canister. It's so easy you can't go wrong! Unless you don't get a good seal on it like me in this video
Combine whipping cream, powdered sugar, and vanilla extract in a bowl and whisk until smooth.
Pour cream mixture into whipping cream dispenser and screw on top.
Screw on decorating nozzle.
Place N2O canister into cap and twist onto lid quickly and tightly.
Shake, point nozzle down, and gently squeeze handle.